| Subject: Re: Scheduling mechanism for linux red hat 7.0? |
Author:
stef
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Date Posted: 08:46:43 03/03/03 Mon
In reply to:
Iris
's message, "Scheduling mechanism for linux red hat 7.0?" on 12:38:54 02/19/03 Wed
Thereis linux main scheduling scheduling policy SCHED_OTHER (look at pthread_create man)
which is the normal unix scheduling policy (no static priority, priority (nice) evolves, such as all process get CPUTIME)
There is also 2 others scheduling policy (SCHED_RR and SCHED_FIFO) which are reserved for root and are priority based, but CANNOT preempt kernel.
If you need hard realtime with priority and kernel preempt, you can use non standard REALTIME API (RTAI is opensource and RTlinux, kind of open source BUT with restriction due to
patent problem with RTlinux founder V.Yodaken) both need kernel patch/rebuild.
stephane
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